Die during the boss fight
Put the laptop together
Defeat the boss
Smash the enemy to the ground with gravity gun
Ride the elevator with the drone helper in story mode
Defeat 5 enemies in a row with environmental assets only without taking any damage.
Defeat 10 enemies in a row using the Combo Module level 10
Take more than 1000 damage in a single playthrough.
Die after 50th wave
Eliminate 3rd boss without hitting him in the eye